Elevator system



Dec. 15, 1936. D. c. LARsbN 2,064,170

' ELEVATOR SYSTEM Filed Feb. 21, 1935 4 Sheets-Sheet l 4.444 awe LM INVENTOR BY MW ATTORNEY ELEVATOR SYSTEM Filed Feb. 21, 1935 4 Sheets-Sheet, 2

ELEV. N I ELEV. N 2

4w 0M1 LW INVENTOR' BY ATTORNEY Dec. 15, 1936.

D. c. LARSON 2,064,170

ELEVATOR SYSTEM Filed Feb. 21, 1955 4 Sheets-Sheet 5 FIGS 4M cm: LM INVENTOR ATTORNEY Dec. 15, 1936. a ON 2,064,170

ELEVATOR SYSTEM Filed Feb. 21, 1955 4 Sheets-Sheet 4 4. w LM INVENTOR BY ATTORNEY Fie.4

Patented Dec. 15, 1936 UNlTED STATES FATENT OFFIQE ELEVATOR SYSTEM Application February 21, 1935, Serial No. 7,472

14 Claims.

The invention relates to elevator systems and is directed particularly to systems for elevators in which push buttons or the like are employed.

The invention is applicable to any form of elevator system in which push buttons are provided. It is particularly useful in systems in which the elevator car serves a plurality of landings and is under the control of a plurality of push buttons, at least one for each or the landings served, and in which the pressing of each of these push buttons stores in a floor relay a call which is answered by the car as it arrives at the landing for which the push button is provided. The push buttons may control the starting as well as determine the floors at which stops are made.

One feature of the invention resides in the push buttons opening circuits to register calls.

Another feature is to eliminate duplicate stops due to a push button being held in operated condition.

Other features and advantages will become apparent from the following description and appended claims.

The invention will be described as applied to a plural elevator system in which the starting of each elevator car from a fioor at which a stop has been made is under the control of an attendant in that car. Stops to discharge passengers are made in response to push buttons in the car operated by the attendant as directed by the passengers. Stops to take on passengers are made in response to push buttons at the landings operated by the intending passengers themselves. The push buttons at the landings are common to all the cars of the group and are efiective to cause the stopping of any one of the cars. Such a system of control is illustrated in the application of Harold Waters and William Frank Glaser, Serial Number 752,241, to which, by way of example, the invention will be illustrated as applied. Only such parts of the control system are shown which are believed suflicient to illustrate the principles ment for providing the control provided by the system of Figure 2 and Figure 4 is a schematic representation of parts of the selector machine illustrated in the above Waters and Glaser application.

Referring to Figure 1, each car is started by means of a start control switch operated by the attendant in the car. This switch has several circuit controlling contacts, only one pair of which is illustrated and designated l5. The slowing down of the cars is controlled by push buttons within the car and push buttons at the landings in cooperation with selector mechanism for each car, the selectors acting to select the car which answers each of the calls registered by the push buttons at the landings.

Only the push button control circuits for the push buttons at the landings are illustrated. These push buttons act through floor relays to control the operation of the cars. For simplicity, 20 control circuits for only four floors are shown. At the intermediate floors, both an up push button and a down push button are provided. Only one push button is provided at each terminal floor, the first and the fourth floors in the arrangement shown. The push buttons at the terminal floors and their circuits may be omitted when the circuits are arranged to cause the cars always to stop at these floors.

The push buttons at the landings, known as hall buttons, are designated generally by the letters HE. To these letters are added characters indicative of the floor and direction of travel for which the button is provided. For example, HBZU designates the up hall button at the second floor.

The floor relays through which the hall buttons act to register calls are illustrated as of the latching type, ,i. e., each relay, upon operation, becomes latched in operated condition and is 0 maintained latched until circuits are set up in answering the call to release the latch. Each of these relays comprises an operating coil 5,

a restoring coil 6, and contacts 1. The floor relays are designated generally by the letters FR. 45 To these letters are appended characters indicative of the floor and direction for which the relay is provided, as in the case of the hall buttons.

The hall buttons and their floor relays are common to the elevators of the group, the con- 0 tacts l of the relays being connected to bus bars designated BB. Connections are taken from the bus bars to stationary contacts of the selector machines of the elevators of the group. Inasmuch as the connections to the selectors and the remaining circuits illustrated are the same for all of the elevators of the group, only those for one elevator (car No. 1) will be described.

Referring to the circuits for car No. 1, the selector contacts shown are arranged in four vertical columns. The contacts in two of these columns are designated generally by the letters and those in the remaining two columns by the letters CR. Those contacts designated CP are in the call pick up circuits and are termed call pick up contacts, while those designated CR are in the call restoring circuits and are termed call restoring contacts. In addition, each of these contacts is designated in accordance with the floor and direction for which it is provided. These contacts are connected to the correspondingly designated bus bars BB.

A brush is provided on the selector for cooperation with the contacts in each column. These brushes, designated H, l2, l3 and M, are movable as a unit to engage the contacts in their respective columns individually. Brush H is for engaging the down call pick up contacts. Brush i2 is for engaging the down call restoring contacts. Brush l3 is for engaging the up call restoring contacts. Brush E 2 is for engaging the up call pick up contacts.

One of the sources or" current illustrated is for supplying current to operating coils 5 or" the floor relays. This source, hereinafter termed the main source, is common to all elevators of the group and is usually the power supply mains for the building. Each elevator has an individual source of current supply which is usually derived from the main source. The restorin coils of the floor relays are supplied with current from the derived sources. It will be assumed that the main source is of alternating current power supply, its mains be g designated Li and L2. Each derived source will be assumed to be direct current supply derived from the main source by a motor generator set for the elevator for which the derived source is provided. The arrangement of the sources of current supply depends upon the character of the particular installation and in certain instances, as where direct current is supplied to the building, these sources may be the same. The circuits for the restoring coils and contacts of the floor relays from the negative sides of the derived sources to the bus bars are common to the elevators of the group, the derived sources being grounded on their negative sides to provide a. common return circuit. It is preferred to have the control mechanism individual to each elevator car subject to contacts which are closed only when the elevator is in service. Such contacts are illustrated for the circuits shown and are designated C and 0+.

To start the car, the attendant in the car moves the start control switch to start position, which closes contacts l5, completing a circuit for coil 16 of stop magnet SM on the selector. This circuit extends from contacts 3+ through contacts 15, contacts 23 of the starting switch sequence relay OC, resistance, coil N3 of the stop magnet, to contacts 0-. The energization of this coil causes the stop magnet armature I! to be attracted, which acts through linkage to close contacts 18 and I9 and separate contacts 20. The separation of contacts 26 disconnects brushes l2 and l3 from contacts 0+. The engagement of contacts I9 prepares a circuit for another coil 2| of the stop magnet.

Upon the closure of the hatchway door at the door at which the car is positioned, the car is started in a direction determined by direction controllin switching mechanism. Only a portion of this switching mechanism is shown, this being for controlling the elfectiveness of the selector brushes and being designated P. Incident to the starting of the car, switch HG is operated, energizing coil 22 of starting switch sequence relay OC, which separates its contacts 23 to break the circuit for initially energizing coil 16 of stop magnet SM. This coil is maintained energized, however, through contacts ll? of the stop magnet and contacts 24 of switch HG, which remain closed until the car is brou ht to a stop.

Upon the car, during its travel in either direction, nearing a door at which a push button for that direction has been pressed, it is caused to slow down and stop at that floor. The operating coil 5 of each floor relay is connected through condensive reactance CO to the main source of supply. Each hall button has normally closed contacts which are connected in a circuit which bypasses the operating coil the fioor relay provided for the push button. This places the push button contacts in series with condensive reactance directly across the line. By using condense-rs of good quality, any power loss is practically eliminated.

With this arrangement, the operating coil oi each fioor relay is maintained deenergized until its by-passing hail button is pressed. The pressing of any hall button opens th by-pass circuit for the operating coil of its floor relay, causing this coil to be energized. Energization of the operating coil effects the engagement oi the relay contacts, whereupon latch 30 latches the contacts in engaged condition. The relay contacts connec he corresponding selector stationary contacts CP and CR of each elevator to one side of the derived source, rendering these contacts alive.

In starting the elevator car in accordance with the arrangement of the above identified Waters and Glaser application, the selector brushes are first advanced with respect to the elevator car and, upon advancing the full amount permitted, are thereafter moved in accordance with car movement. Upon the engagement of an alive call pick up contact for the direction of car travel by its brush, either during the advancement of the brush or its movement in accordance with car movement, the stop magnet is caused to release its armature. This causes the device upon which the brushes are mounted to be brought to a stop in the position to which it has moved and, through the return of the stop magnet contacts to their former condition, the reset or" the door relay. The advance of the brushes is taken up as movement of the car takes place and through this action the car is slowed down and finally brought to a stop at the landing for which the alive contact is provided.

In order that this may be more readily understood, assume that the direction controlling switching mechanism for elevator No. 1 is set to cause the car to be started in the up direction. Under such conditions, switch P is in a condition wherein its contacts 25 and 28 are separated and its contacts 21 and 28 are engaged, this being the condition in which the switch is illus-- trated. This opens the circuits to brushes II and I2 and renders brushes l3 and M efiective. Assume further that the up third floor hall button HB3U is pressed. This removes the by-pass for operating coil 5 of relay FRSU which operates to engage its contacts 1. These contacts, upon engagement, connect contacts CP3U and CR3U of each selector to the common grounded negative line of the derived sources, rendering these selector contacts alive. These contacts are maintained alive as the floor relay contacts are latched in engagement.

Upon the engagement of selector contact CP3U of elevator No. 1 by its brush 14, a circuit is completed for coil 2| of the stop magnet. This circuit is from contacts through contacts i5, coil 2|, contacts 28, brush 14, contact CP3U, bus bar BBSU, contacts 1 and reset coil 6 of the up third floor relay, to ground. Coil 2|, upon energization, acts to neutralize coil 56 so that the stop magnet armature I! is released. This separates stop magnet contacts l8 and i6 and engages stop magnet contacts 26. The separation of contacts l3 and of contacts l9 breaks the circuits for coils l6 and 2| respectively of the stop magnet. completes the circuit through contacts 21 of direction switch P to brush i3. This brush is in engagement with contacts CR3U at this time, thereby completing another circuit through the restoring coil of the up third floor relay. The completion of this circuit causes sufiicient Voltage to be applied to this coil to effect the release of latch 36 and the restoration of contacts 7 to ope-n condition.

The release of stop magnet armature ll causes the functioning of other mechanism, which acts to slow down the car as it arrives at a certain distance from the third floor and finally to bring it to a stop at that floor. This mechanism is shown schematically in Figure 4- and will be described later.

Stops in response to down buttons during downward travel of the car are made in a similar manner and will not be described, switch P being in position engaging contacts 25 and 26 and separating contacts 2'! and 28, thereby rendering brushes H and i2 effective instead of brushes l3 and [4.

With the arrangement of the push buttons in circuits by-passing the operating coils of their floor relays, should any button fail, the bypass circuit is broken, operating the floor relay. Under such conditions, each car is caused to stop at the iloor at which the button is located as it arrives at that floor travelling in the direction for which the button is provided. Thus, with no passenger awaiting, it soon becomes evident that the button has failed, so that the fault can be remedied. In other words, the button, in failing, acts automatically to call attention to the failure.

Referring to Figure 4, the stop magnet SM is mounted on a crosshead 35 which is driven by the elevator car through sprocket 36, shaft 31, bevel gearing 36 and vertical screw 39. This crosshead carries a motor 4| which is energized through the engagement of contacts 42 of the stop magnet in effecting the starting of the car. The motor, upon energization, acts through gearing 43 to drive a shaft 44. Upon this shaft are mounted a plurality of cams 45 which operate speed controlling switches 40. Also on this shaft is a pinion 46 which acts through rack 47 to move a carriage 48 with respect to the crosshead. The carriage and mechanism carried thereby are counterbalanced by means of counterweight 49. The direction of rotation of motor 4| is controlled by the switching mechanism which controls the The engagement of contacts 25 direction of movement of the elevator hoisting motor, to cause the movement of the carriage with respect to the crosshead to be one of advancement.

The carriage, in advancing, slides on guide bar 56 on which are provided stop collars for limiting the amount of advance. Pawls 52 and 53 are mounted on the carriage for cooperating with stops 54 on a standard of the selector machine to bring the carriage to a stop. There is one stop for each floor and these stops are spaced in accordance with the distances between the floors for which they are provided. The pawls are pivotally mounted on the carriage and are biased by springs into positions for cooperating with the stops. The stop magnet, upon energization to attract armature l1, acts through a cam 55 to move the pawls to positions where they clear the stops during movement of the carriage. The carriage also carries the brushes for cooperating with the selector stationary contacts. Only one brush is shown in this figure and this brush may be considered as brush l3 which cooperates with up stationary call restoring contacts CRU.

The circuit for the motor 4! is shown in Figure 2. It is of the split field type, its field windings being designated 56 and 51 and its armature 58. The direction of rotation of the motor is controlled by contacts 60 and 6| of direction switch P. Upon movement of the starting switch to start position to start the car, it closes additional contacts 62 which, together with the engagement of contacts 42 by the stop magnet, completes the circuit for motor 4|. Upon operation of switch HG, its contacts 65 close to by-pass start control contacts 62. The circuit for the motor, for up car travel for example, is from contacts 0+ through car switch contacts 62 or contacts 65 of switch HG, contacts 42, contacts 66, armature 58, field winding 56, resistance 63, to contacts 0-. Field winding 51 is connected across the armature to provide speed regulation and resistance 64 is connected across the armature and field winding 56 for purposes of speed adjustment. Similar connections are provided for down car travel when contacts 6| of direction switch P are engaged and contacts 60 are separated. This connects field winding 51 in series with the armature and field winding 56 in parallel thereto.

The motor continues to advance the carriage either until the carriage is brought to a stop by stop collar 5| or until the motor is deenergized as a result of the engagement of an alive call pick up contact for the direction of car travel by its brush. When brought to a stop by engaging a stop collar, the carriage is thereafter moved along with the crosshead until an alive pick up contact is engaged by its brush. The engagement of an alive pick up contact by its brush, energizes neutralizing coil 2 I of the stop magnet to effect the release of armature l1. This results in the separation of contacts 42 to deenergize motor 4!. Cam 55 is biased by the weight of armature I1 and the linkage connected thereto to release the pawls. Thus, the pawl for the direction of car travel is extended for engagement with the stop for the floor for which the alive contact is provided. The stops are set so that only a small clearance is provided for the pawls. This clearance is quickly taken up by movement of the crosshead, bringing the carriage to a stop. Continued movement of the crosshead takes up the advance of the carriage and, in doing so, acts through rack 41 and pinion 46 to restore the speed controlling switches, causing the car to be slowed down as its arrives at decreasing distances from the floor for which the stop is provided and finally to be brought to a stop at the floor.

As above explained, upon engagement of stop magnet contacts 29 as a result of the release of armature ll, the reset of the floor relay is eiiected through the selector CR contact for that relay and the brush engaging that contact. This brush is in engagement with this contact at the time the carriage is brought to a stop by the engagement of the pawl with the stop collar and is thereafter maintained in engagement with the contact during the whole slow down period and until the start control switch is operated to start the car from the landing. Should the push button be pressed again, after the call has been picked up, the restoring coil of the floor relay is energized immediately the relay contacts engage, preventing the latching of the contacts in engaged condition. Thus, the relay contacts separate immediately the push button is r leased, so that call is not registered and a false or duplicate stop is not made after the push button is release An arrangement is illustrated in re which, once a call has been picked up, the energization of the operating coil of the floor relay is prevented until the car which has picked up the call has been slowed down and brought to a stop at the floor at which the relay is provided and until the start control switch for car is cperated to start the car away from the floor. This prevents the reoperation oi the relay to engage its contacts during this period and thereby prevents false or duplicate stops from cause whatsoever.

Such prevention or" reoperation of the floor relays is efiected by means of a plurality of additional relays, one for each of the floor relays. Each additional relay is designated generally by the letters SP and also as to the floor and direction for which it is provided. The contacts it of each SP relay are connected in the circuit for the operating coil of the corresponding floor relay. Tins, so long as an SP relay is operated, energization of he operating coil of the corresponding floor l to eiiect operation thereof is prevented. The is of the additional relays are connected directly from the grounded negative line to the corres ond' lector machines. Th in ans -ering a call, When a circuit is completed for the restoring coil 6 of an op :ated floor relay to reset the relay, the circuit for the coil or he corresponding SP relay is also completed. This relay operates immediately to separate its contacts "iii in the circuit for the operating coil of t e floor relay. As the selector brush maintained in engagement with the CR contact and as contacts 20 of the stop magnet SM remain in engagement until the start control switch is again operated to start the car after the stop has been completed, the SP relay is maintained operated during this period, preventing operation of the floor relay to engage its contacts.

Assume that car No. l set for upward travel and that an up third floor call is registered. Upon the engagement of brush with contact CPSU, a circuit is completed for the stop magnet neutralizing coil It is to be noted that this circuit does not pass through th restoring coil 6 of the up third floor relay the circuit extending from contacts C+ through contacts 59, coil 2%, contacts 9Q brush i l, contact CPSU, bus

bar BBPEU, contacts 7, to ground. The circuits for the restoring coils of the fioor relays are separate and lead to bus bars diiieren from those for the call pick up circuits. To distinguish these bus bars, those in the call pick up circuits are designated BB? and those in the call restoring circuits are designated BB1 This arrangement of separate call picl: up and call restoring circuits be used, if desired, instead of the common circuits in the arrangement of Figure l.

The neutralization of t 1e stop magnet operating coil causes engagement of contacts 29 to establish r storing circuit for the up third floor relay by way of bus bar BBRBU. The engagement of these contacts also comple es a circuit for the coil of relay SP3U from contacts (3+, through contacts 20, contacts 21, brush l3, contact CR3U, bus bar BBRElU, coil of relay SPSU, to ground. Relay SPSU operates to separate its contacts 10 in the circuit for coil 5 of relay FRSU, preventing the energisation of this coil. For example, should the up third floor hall button HBSU be held pressed manually during the period from the time a call r gistered by this button is picked up until the start control switch is again operated to start the car, after the stop has been completed, the circuit for the operating coil of the floor relay is not completed owing to contacts "ll; of relay SPLU being separated. Thus, should the call pick up contact CPSU or the selector for car No. 2 be engaged by its brush l4 during this period with car No. 2 set for upward travel, no circuit is completed, thereby avoiding a duplication of the stop.

In Figure 3, a. control arrangement is illustrated similar to that of Figure 2 but in which floor relays are provided of the type electrically maintained in operated condition instead of those mechanically latched in operated condition. Upon the pressure of any hall button to remove the by-pass circuit for the operating coil H of the relay, the relay 0 erates, not only to engage its contacts 72 which render selector contacts alive but also to separate contacts 13 to maintain the by-pass circuit broken and thus the relay coil energized after the push button is released. The SP relays have contacts designated 55 in the call pick up circuits in addition to contacts 10 in the circuits for the operating coils of the floor relays. These additional contacts are for the pur pose of opening the call pick up circuit at the same time the circuit is established to restore he floor relay.

As an example of operation, assume that the up second floor hall button HBZ'U is pressed. This removes the lay-pass circuit for the coil ll of the up second floor relay FRZU. This relay operates to en age its contacts 12, rendering the call pick up contacts CPEU of the selectors alive. It also separates its contacts 13 to establish a selfholding circuit.

Upon the engagement of selector contact CPZU of elevator No. l, ioixexample, by its brush, with switch P set for up car travel, a circuit is com pleted for neutralizing coil 2i oi the stop magnet from contacts 0+, contacts l9, coil 2|, contacts 28, brush 14, contact CP2U, bus bar EBPZU, contacts 15 of relay SPZU, contacts 12 of floor relay FREU, to ground. This eilects the release of the stop magnet armature H and consequently the engagement of contacts 20, completing the circuit for the coil of relay SPZU through brush l3 and contact CRZU. This relay operates to separate its contacts 10 in the circuit for coil ll, deenergizing this coil to reset the floor relay. 7

It also separates its contacts 15 to immediately open the call pick up circuit. The additional contacts 75 may be omitted, if desired, as the call pick up circuit is also opened by contacts 72 of the up second floor relay upon the reset of this floor relay.

ihe immediate opening of the call pick up circuit prevents the duplication of the stop by another car and the opening of the energizing circuit for the floor relay operating coil prevents the reoperation of this relay until the start control is operated to start the car after the stop at the second floor has been completed.

Arrangements for preventing false or duplicate stops, exemplified in Figures 2 and 3, are also applicable to systems in which the floor relays are controlled in other ways, as for example Where the push buttons are arranged in series with the operating coils of their respective floor relays. With such arrangement in the circuits of Figure 3, contacts 73 of each floor relay would be making contacts arranged to Icy-pass the push button for that floor relay.

In each of Figures 1, 2 and 3, an impedance is illustrated in the circuit for the operating coil of each floor relay. This prevents a short-circuit on the main supply lines when the push button for that floor relay is not operated. It is preferred to employ condensive reactances for this purpose and such reactances are shown in the arrangements of Figures 1 and 3. Condensive reactances have the advantage of low initial cost. They also are economical in operation in that they reduce the power losses in the floor relay operating coil circuits to a minimum. By employing condensers of good quality with minimum leakage, the power loss in each operating coil circuit when the push button is not pressed is negligible.

Inductive reactances may be employed instead of condensive reactances, if desired. Inductive reactances are illustrated in the circuits of Figure 2, in which they are designated ID. Also resistances may be employed, particularly when the source of current supply for the floor relay operating coils is direct current.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

What is claimed is:

1. In an elevator system; a floor relay having an operating coil; a source of alternating current;

a circuit connecting said operating coil to said source; condensive reactance in said circuit; a normally closed push button switch; and means connecting said push button switch in shunt to said operating coil.

2. In an elevator system in which the elevator car serves a plurality of floors; a plurality of relays, one for each of said floors, each relay having an operating coil; a source of alternating current; a circuit for each operating coil connecting it to said source; a condenser in each of said circuits; a by-pass circuit for each coil; and a normally closed push button switch in each by-pass circuit adapted, upon being pressed, to open the bypass.

3. In an elevator system in which the elevator car serves a plurality of floors; a plurality of floor relays, one for each of said fiOf'lS, each relay comprising contacts and an operating coil; a plurality of condensive reactances, one for each operating coil; a source of alternating current; a circuit for each operating coil for connecting the coil in series with its reactance to said source; a by-pass circuit for each operating coil; and a plurality of push button switches, one in each by-pass circuit, each push button, upon being pressed, breaking the by-pass circuit in which it is connected, thereby to effect suffici nt energization of the relay coil for which the by-pass is provided to cause the operation of the relay contacts.

4. In an elevator system in which the elevator car serves a plurality of floors; a plurality of floor relays, one for each of said floors, each relay comprising an operating coil, contacts, means for latching the contacts in operated condition, and a restoring coil for releasing said latching means to reset said contacts; a plurality of condensive reactances, one for each operating coil; a source of alternating current; a circuit for each operating coil for connecting the coil in series with its reactance to said source; a control push button for each of said floor relays, each push button having normally closed contacts; and means connecting said contacts of each push button across the operating coil of the floor relay for which the push button is provided so that normally such coil is by-passed and the relay is not operated, the total impedance of the circuit for such coil when the push button is pressed to remove the by-pass being such as to cause sufiicient energization of the coil to eifect the operation of the relay to latch its contacts in operated condition.

5. In an elevator system in which the elevator car serves a plurality of floors; a plurality of floor relays, one for each of said floors; a plurality of controls, one for each of said relays, each control, upon operation, causing operation of the relay for which it is provided; means actuatable in accordance with car movement for restoring any operated floor relay at least by the time that the car arrives from a given direction at a certain distance from the floor for which such relay is provided; means for slowing down the car and bringing it to a stop at such floor; means for starting the car away from such floor; and means operable upon restoring said floor relay for such floor to maintain it in restored condition until said starting means is operated to cause the starting of the car away from such floor, even though said control for such floor relay is operated during such period.

6. In an elevator system in which the elevator car serves a plurality of floors; a plurality of floor relays, one for each of said floors; a plurality of controls, one for each of said relays, each control, upon operation, causing operation of the relay for which it is provided; means for each relay for latching that relay, once operated, in operated condition; means actuatable in accordance with car movement for releasing the latching means for any operated floor relay to reset the relay at least by the time that car arrives from a given direction at a certain distance from the floor for which such relay is provided; means for slowing down the car and bringing it to a stop at such floor; means for starting the car away from such floor; and means operable at substantially the same time that said floor relay for such floor is reset for preventing reoperation of such relay until said starting means is operated to cause the starting of the car away from such floor, even though said control for such floor relay is operated during such period,

7. In an elevator system in which the elevator car serves a plurality of floors; a plurality of floor relays, one for each of said floors, each relay oeing normally in one of two conditions; switching mechanism comprising a plurality of circuit controlling means, one for each of said floors, means for cooperating with each circuit controlling means, and means for causing relative movement between said circuit controlling means and said cooperating means to sheet cooperation of said cooperating means with each of said circuit controll ng means in Succession; a plurality of controls, one for each of said floors, each control, upon operation, causing the door relay for the floor for which the control is provided to assume its other condition; means responsive to assumption by any relay of its other condition for maintaining such relay in that condition until cooperation of said cooperating means with said circ it controlling means for the floor for which such relay is provided, such cooperation causing such floor relay to be restored to said one con dition; car actuating and stopping mechanism; means for causing said mechanism to slow down the car and bring it to a stop at the floor for which such relay is provided; means for causing operation of said mechanism to start the car away from such floor; and means operated at the time such floor relay is restored for preventing said iloor relay assuming said other condition until said starting means is operated to cause the starting of the car away from such floor, even though said control for such floor is operated during such period.

8. In an elevator system in which the elevator car serves a plurality of floors; a plurality of floor relays, one for each of said floors, each relay being normally one or" two conditions; switching mechanism. comprising a plurality of circuit controlling means, one for each of said floors, means for cooperating therewith and means for causing relative movement between said circuit controlling means and said cooperating means to eiiect cooperation of said cooperating means with each of said circuit controlling means in succession; a plurality of controls, one for each of said floors, each contr l, upon operation, causing the floor relay for the floor for which the control is provided. to assume its other condition; means responsive to assumption by any relay of its other condition for maintaining such relay in that condition; means responsive to the cooperation of said cooperating means with said circuit controlling means for any iioor for which a floor relay is operated for restoring such floor relay to said one condition; car actuating and stopping mechanism; means responsive to such cooperation of said cooperating means and said circuit controlling means for such floor for causing said mechanism to slow down the car and bring it to a stop at such floor; means for caus ing operation of said mechanism to start the car away from such floor; and means responsive to such cooperation of said cooperating means and said circuit controlling means for such floor for maintaining said floor relay for such floor in said one condition from the time such co operation takes place until said starting means is operated to cause the starting of the car away from such floor, even though said control for such floor is operated during such period.

9. In an elevate in which the elevator car serves pl 'ty of fiGCl's; a plurality of floor relays, one each of said floors; switching mechanism comprising a plurality of circuit 1 said coopeiatin means for such and .1 going mechanism; 51-62115 responsive to such coopera 'on of said circuit controlling for such floor with coope"a g means for causin said mechain to slo d vn the car and l: ing it to a stop at such floor; means for cau o eration of said mechanism to start the car a"- y from such floor; and means responsive to such cooper non of said circuit controlling means for such floor with said cooperating means preventing reoperation of said floor relay for 5a floor from the time such cooper on takes pla 9 until said starting means is operated to cause the starting of the car from such floor.

10. In an elevator system in =hich the elevator car serves a plurality of iloors; a plurality of door relays, one for each of said floors; a plurality of additional relays, one for each of said floors; switching mechanism comprising a plural ity of stationary contacts, one for each of said floors, a contact movable to engage said stationary contacts individually, and means for moving said movable contacts; a plurality of controls, one for each fioor relay, each control, upon operation, causing operation of its floor relay; means responsive to the operation of any floor relay for maintaining the relay operated and for closing a circuit to the stationary contact for the floor for which the floor relay is provided; means responsive to the engagement of such stationary contact by its movable contact during movement thereof in a given direction for causing operation of said additional relay for such floor; means responsive to the operation of such additional relay for restoring the floor relay for such floor; car actuating and stopping mechanism; means responsive to such engagement of said stationary contact for such floor by its movable contact for causing said mechanism to slow down the car and bring it to a stop at such floor; means for causing operation of said mechanism to start the car away from such floor; and means for maintaining such additional relay, once operated, in operated condition until said starting means is operated to cause the starting of the car from such floor, to prevent reoperation of said floor relay for such floor.

11. In an elevator system in which the elevator car serves a plurality of floors; a plurality of floor relays, one for each of said floors; a plurality of additional relays, one for each of said floors; switching mechanism comprising two rows of stationary contacts, one contact in each row for each of floors, a movable contact for each row of stationary contacts, each movable contact 3 upon movement, to ene individu the contacts in the row for Lifil l it is provrrled, and means for moving said movable contacts accordance with movement of the elevator car, said contacts being arranged so that one of said stationary contacts for each door is engaged by its movable contact at the same time the other stationary contact for that floor is engaged by its movable contact; a plurality of push buttons, one for each floor relay, each push button, upon being pressed, establishing a circuit its floor relay to cause op eration thereof; means responsive to the operation of any or relay for establishing a selfholcling circuit for the relay and for closing a circuit to said other stationary contacts for the for the floor relay is provided; means responsive to the engagement of such other stationary contact by its movable contact during movement thereof in a given direction for completing a circuit for the additional relay for such floor through one stationary contact for such floor and its movable contact; means responsive to the operation of such additional relay for breaking the circuit for said floor relay for such floor to restore said floor relay; car actuat ing and stopping mechanism; means responsive to such engagement of said other stationary contact for such floor by its movable contact for causing said mechanism to slow down the car and bring to stop at such floor; means for oausin of said mechanism to start the car from such floor; and means for maintainniovable contact for said one stationary contact for floor in engagement therewith to m tain the additional relay for such floor operated from the time such engagement takes place until said starting means is operated to cause the starting of the car from such floor.

12. In an elevator system in which the elevator car serves a plurality of floors; a plurality of floor relays, one for each of said floors; a plurality of additional relays, one for each of said floors; switching mechanism comprising two rows stationary contacts, one contact in each row for each of said floors, a movable contact for each row of stationary contacts, each movable contact being adapted, upon movement, to engage individually the contacts in the row for which it is provided, and means for moving said movable contacts in accordance with movement of the elevator car, said contacts being arranged so that one of said stationary contacts for each floor is engaged by its movable contact at the same time the other stationary contact for that door is engaged by its movable contact; a plurality of push buttons, one for each floor relay, each push button, upon being pressed, establishing a circuit for its floor relay to cause operation thereof; means for each floor relay operable upon operation of the relay to latch the relay in operated condition, operation of any floor relay closing a circuit to each of the stationary contacts for the floor for which such floor relay is provided, at least one of said circuits including the restoring coil of the floor relay; means responsive to the engagement of said other stationary contact for any floor for which a floor relay is operated by its movable contact, during movement of said movable contact in a given direction, for completing a circuit for the additional relay for such floor through the other stationary contact for such floor and its movable contact and for releasing the latching means such floor relay to reset the floor relay, such ditional relay, upon operation, breaking the suit for the floor relay for such floor; car actuating and stopping mechanism; means responsive to such engagement of said other stationary contact for such floor by its movable contact for causing said mechanism to slow down the car and bring it to a stop at such floor; means for causing operation of said mechanism to start the car away from such floor; and means for maintaining said additional relay for such floor operated from the time such engagement of said movable contact for one stationary contact for such floor takes place until said starting means is operated to cause the starting of the car from such floor to maintain the circuit for the operating coil of the floor relay for such floor broken during such period.

13. In an elevator system in which the elevator car serves a plurality of floor relays, one for each of said floors, each floor relay comprising two pairs of contacts and an operating coil; a plurality of additional relays, one for each of said floors, each additional relay comprising two pairs of contacts and an operating coil; switching mechanism comprising two columns of stationary contacts, one contact in each column for each of said floors, a movable contact for each column of stationary contacts, each movable contact being adapted, upon movement, to engage individually the contacts in the column for which it is provided, and means for moving said movable contacts in accordance with movement of the elevator car, said contacts being arranged so that one of said stationary contacts for each floor is engaged by its movable contact at the same time the other stationary contact for that floor is engaged by its movable contact; a plurality of push buttons, one for each floor relay, each push button, upon being pressed, establishing a circuit for the operating coil of its floor relay to cause operation of the floor relay contacts, one pair of such floor relay contacts establishing a self-holding circuit for the relay and the other pair closing a circuit to said other stationary contact for the floor for which the floor relay is provided; means responsive to the engagement of such other stationary contact by its movable contact during movement thereof in a given direction for completing a circuit for the operating coil of the additional relay for such floor through said one stationary contact for such floor and its movable contact, one pair of contacts of such additional relay, upon operation, opening said circuit to said other stationary contact for such floor and the other pair of con-- tacts of such additional relay, upon operation, breaking the circuit for the operating coil of the floor relay for such floor; car actuating and stop ping mechanism; means responsive to such engagement of said other stationary contact for such floor by its movable contact for causing said mechanism to slow down the car and bring it to a stop at such floor; means for causing operation of said mechanism to start the car away from such floor after the stop has been completed; and means responsive to such engagement of said other stationary contact for such floor by its movable contact for maintaining said movable contact for said one stationary contact in engagement therewith from the time such engagement takes place until said starting means is operated to cause the starting of the car from su h floor to maintain said additional relay for such floor operated, thereby preventing the reestablishrnent or" the circuit for the operating coil of the floor relay for such floor during such period.

14. In an elevator system in which the elevator car serves a plurality of doors; a plurality of floor relays, one for each of said floors, each floor relay comprising contacts, an operating coil, a latch and a restoring coil; a plurality of additional relays, one for each of said floors, each additional relay comprising contacts and an operating coil; switching mechanism comprising two columns of stationary contacts, one contact in each column for each of said floors, a movable contact for each column or stationary contacts, each movabl contact adapted, upon movement, to engage ividually the contacts in the column for which it is provided, and means for moving said movable contacts in accordance with movement of the elevator car, said contacts being arranged so that of said stationary contacts for each floor is ag-d by its movable contact at the same time the other stationary contact for that floor is enby its movable contact; a plurality of push ns, one for each floor relay, each push button, upon being pressed, establishing acircuit for the operating coil of its floor relay to cause operation of the floor relay contacts, said latch or" such relay acting upon operation of the relay contacts to latch the contacts in operated condition, operation of such relay contacts closing a circuit to each of the stationary contacts for the floor for which he floor relay is provided, at least one of said in uits including the restoring coil of the floor cla means responsive to the engagement of said other stationary contact for such floor by its movable contact, during movement thereof in a given direction, for completing a circuit for the operating coil of the additional relay for such floor and for the restoring coil or" the floor relay for such. fioor through the other stationary contact for such fioor and its movable contact, said restoring coil acting to release the latch for such floor relay to reset the floor relay, and said opercoil of such additional rhay acting to operate the contacts of the relay, which contacts, upon ation, breal; the circuit for the operating coil or the floor relay for such floor; car actuating and stopping mechanism; means responsive to such engagement of said other stationary contact for such floor by its movable contact for causing said mechanism to slow down the car and bring it to a stop such floor; means for causing operation of said mechanism to start the car away from such floor after the stop has been completed; and means responsive to such engagement of said other sta oionary contact for such floor by its movable contact for in intaining said movable contact for said one stationary contact in engagement therewith from the time such engagement takes place until said starting means is operated to cause the starting of the car from such floor to iaintain said additional relay for such floor operated, thereby preventing the reestablishment of the circuit for the operating coil of the floor relay for such floor during such period.

DAVID CARL LARSON. 

